Iridium complex and preparation method thereof, electroluminescent device using iridium complex

Abstract

The invention relates to iridium complexes and a preparation method thereof, and an electroluminescent device using the iridium complexes, particularly iridium complexes using 2-(5-(3-pyridyl-1,3,4-oxadiazolyl-2-)phenols as auxiliary ligands. The main ligands in the iridium complex molecules are 2-(4,6-ditrifluoromethylpyridyl)pyridine, 2-(4,6-ditrifluoromethylpyridyl)pyrimidine, 2-(4,6-ditrifluoromethylpyridyl)pyrazine and 2-(4,6-ditrifluoromethylpyridyl)triazine derivatives. The novel iridium complexes provided by the invention have the advantages of high luminescence efficiency, high electron mobility, stable chemical properties, easy sublimation and purification and the like; and the device has favorable properties. The molecular structure of the modifying main ligands can regulate the luminescent intensity and efficiency of the complexes within the green light wavelength range, thereby facilitating the design and production of the organic electroluminescent displays and illuminating light sources.

Description

【Technical Field】 [0001] The present invention relates to the technical field of organic electroluminescence devices, and in particular to a type of iridium complexes, a preparation method thereof, and electroluminescence devices using the iridium complexes. 【Background technique】 [0002] Against the background of increasing global energy demand and the worrying ecological environment, governments of various countries have vigorously developed high-tech-based sustainable energy-saving technologies and industries. Organic electroluminescent devices (OLEDs) have attracted much attention due to their wide viewing angles, high brightness, low energy consumption and many advantages such as flexible devices. They are called the key technology that will dominate the future display world. In recent years, a large number of studies have shown that among many heavy metal complexes, iridium complexes are considered to be the most ideal choice for phosphorescent materials for OLEDs. Has 5d...

AI Technical Summary

Problems solved by technology

In addition, in the current commonly used materials, the hole mobility of hole transport materials is much higher than that of electron transport materials, and the commonly used host materials are mainly hole transport, which will lead to a large number of redundant holes. Aggregation of holes at the interface between the light-emitting layer and the electron-transporting layer

These factors can lead to reduced efficiency and severe efficiency roll-off

Studies have shown that if the iridium complex has a high electron transport ability, it can effectively increase the transport and distribution of electrons in the light-emitting layer, broaden the electron-hole area, balance the number of electron-hole pairs, and greatly improve the device. efficiency, the reduced efficiency of the roll-off

Images